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Chemistry Chapter 8 Review
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Shape of AsBr3
trigonal pyramidal
Shape of CO2
linear
what is the shape of CCl4
tetra-hedral
What is the shape of H2O?
bent
Compare and contrast the properties of ionic and covalent compounds.
ionic - crystalline structure, metals +nonmetals, high melting point. Covalent - nonmetals, properties vary, low melting point, etc see p. 253 for better list
Compare and contrast polar covalent bond and non-polar covalent bond. Be sure to include information on electronegativity, electron sharing, etc.
Polar covalent bonds have an electronegativity diff.of 0.4-1.7; electrons aren’t shared equally. Non-polar electronegativity diff. of 0 shared equally
How does electronegativity influence the character of a bond between atoms? 
The difference in electronegativity determines the character of a bond between atoms (determines if it will be polar or non-polar
What is the VSEPR model theory? What does it state?
States the electron pairs repel each other and determine both the shape of & bond angles in a molecule.
____________________ is the energy required to break the bond between two covalently bonded atoms.
 
Bond dissociation energy
 
Resonance energy
 
Hybridization energy
 
none of the above
Special properties of water, such as adhesion, cohesion, and surface tension can be attributed to which intermolecular force?
 
Hydrogen bonds
 
Van de waals forces
 
london dispersion forces
 
---
________________ occur when polar molecules are attracted to one another.
 
Dipole interactions
 
hydrogen bonds
 
ionic compounds
 
none of the above
In a coordinate covalent bond, ________________________________.
 
one atom contributes both electrons to a coordinate covalent
 
electrons are shared unequally
 
electrons are shared equally
 
none of the above
Intermolecular attractions are _________ than either ionic or covalent bonds.
 
weaker
 
stronger
 
both weaker and stronger
 
none of these
How many pi bonds are there in a triple bond?
 
2
 
1
 
3
Water is an example of a ___________ molecule
 
polar
 
non-polar
 
ionic
 
---
Unequal sharing of electrons between two bonded atoms ALWAYS indicates __________________.
 
a polar covalent bond
 
a nonpolar covalent bond
 
a polar ionic bond
 
an ionic bond
The VSEPR model is mainly used to __________________________________.
 
determine molecular shape
 
write resonance structures
 
determine ionic charge
 
measure intermolecular forces
Which of the following elements has the greatest electronegativity?
 
Fluorine
 
Chlorine
 
Bromine
 
Iodine
How many pairs of electrons are shared in a double covalent bond?
2 pairs
Molecular compounds are generally composed of what kinds of atoms?
non-metals
Which of the following elements has 4 valence electrons?
 
Carbon
 
Nitrogen
 
Boron
 
Sulfur
__________ bonds form between single bonds.
 
sigma
 
pi
 
alpha
 
beta
Which of the following atoms would most likely form a diatomic molecule?
 
all of these
 
oxygen
 
nitrogen
 
hydrogen
A triple covalent bond shares how many total electrons?
6
Covalent bonds form when atoms ________ electrons.
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